Data Register And File Register [D]; Numbers Of Data Registers And File Registers - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
2.8

Data Register and File Register [D]

Data registers store numeric values. File registers are handled as initial values of data registers.
FX and FX
0S 0
Each data register or file register stores 16-bit data (whose most significant bit specifies the positive or
negative sign). Two data registers or file registers combined can store 32-bit data (whose most significant bit
specifies the positive or negative sign).
2.8.1

Numbers of data registers and file registers

The tables below show data register and file register [D] numbers. (Numbers are assigned in decimal.)
1. In FX /FX
3S 3G
General type
D0 to D199
FX /FX
3U 3UC
PLCs
200 points
General type
D0 to D127
FX /FX
3G 3GC
PLCs
128 points
General type
D0 to D127
FX PLC
3S
*1. This area is not latched, but can be changed to the latched (backed-up) area by parameter setting.
*2. This area is latched, but can be changed to the non-latched (non-backed-up) area by parameter
setting.
*3. The characteristics about latch (battery backup) cannot be changed using parameters.
*4. Data registers D1000 and later can be used as file registers in units of 500 points by parameter
setting.
*5. This area can be changed to the latched (battery backed-up) area by parameter setting while an
optional battery is attached, but the latched (battery backed-up) range cannot be specified.
When simple N:N link or parallel link is used, some data registers are occupied for the link.
94
are not applicable to file registers.
→ For the functions and operations of file registers, refer to Subsection 2.8.4.
/FX /FX /FX PLCs
3GC 3U 3UC
Data registers
Latched (battery
backed-up) type
D200 to D511
*1 *2
312 points
Data registers
Fixed latched
(EEPROM backed-
up) type
D128 to D1099
*3 *3
972 points
Data registers
Fixed latched
(EEPROM backed-
up) type)
D128 to D255
128 points 128 points
Fixed latched
(battery backed-up) Special type
type
D512 to D7999 D8000 to D8511
*3*4
7488 points 512 points
General type Special type
D1100 to D7999 D8000 to D8511
*5
6900 points 512 points
General type Special type
D256 to D2999 D8000 to D8511
2744 points 512 points
→ Refer to the data communication manual.
2 Devices in Detail
2.8 Data Register and File Register [D]
File registers (latched (battery
backed-up) type)
*4
D1000 and later
*3
7000 points maximum
File registers (latched (EEPROM
backed-up) type)
*4
D1000 and later
*3
7000 points maximum
File registers (latched (EEPROM
backed-up) type)
*4
D1000 and later
2000 points maximum